Immediately Dangerous to Life or Health (IDLH) Value Profile: Diketene

Basis for IDLH value: The IDLH value for diketene is based on the rat BMCL05 of 181 ppm for lethality in a 1-hour exposure [Katz 1987]. The duration adjusted BMCL05 for a 30-minute exposure is 228 ppm. A composite uncertainty factor of 30 was applied to account for extrapolation from a lethal concentration threshold in animals, animal to human differences, human variability, and database uncertainties, resulting in an IDLH value of 7.6 ppm.